Patch "udf: Avoid overflow when session starts at large offset" has been added to the 3.18-stable tree

Patch "udf: Avoid overflow when session starts at large offset" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    udf: Avoid overflow when session starts at large offset

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     udf-avoid-overflow-when-session-starts-at-large-offset.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 15:03:25 CET 2017
From: Jan Kara <jack@suse.cz>
Date: Mon, 16 Oct 2017 11:38:11 +0200
Subject: udf: Avoid overflow when session starts at large offset

From: Jan Kara <jack@suse.cz>


[ Upstream commit abdc0eb06964fe1d2fea6dd1391b734d0590365d ]

When session starts beyond offset 2^31 the arithmetics in
udf_check_vsd() would overflow. Make sure the computation is done in
large enough type.

Reported-by: Cezary Sliwa <sliwa@ifpan.edu.pl>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 fs/udf/super.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -706,7 +706,7 @@ static loff_t udf_check_vsd(struct super
 	else
 		sectorsize = sb->s_blocksize;
 
-	sector += (sbi->s_session << sb->s_blocksize_bits);
+	sector += (((loff_t)sbi->s_session) << sb->s_blocksize_bits);
 
 	udf_debug("Starting at sector %u (%ld byte sectors)\n",
 		  (unsigned int)(sector >> sb->s_blocksize_bits),


Patches currently in stable-queue which might be from jack@suse.cz are

queue-3.18/mm-handle-0-flags-in-_calc_vm_trans-macro.patch
queue-3.18/udf-avoid-overflow-when-session-starts-at-large-offset.patch